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I'm happy with the first results and now I'd like to optimize a bit. Some of the stuff I've printed looks great other stuff not so much.

I hope you guys have some ideas on how to improve. I think it's most software related stuff as the hardware seems to work just fine (also evident from some of the print results for as far as I can judge).

The Whistle printed with Printrun, sliced by Cura. Also looks good. (Also removed some stringing)

However when I try to print it with print run and slice it with netfabb things go wrong. I've tried different of the preset profiles. Also tried a custom 'hatched' profile.

This is a new fan cover also sliced by netfabb. Result is ok but could be better (see the 'cracks' around the holes and the junk on the surface of the 'legs')

I'm also trying to print a vase-like object from transparent PLA. I've used the Standard Quality Vase profile. The result is ok but I'm getting quite some junk on the surface. Especially on the inside of the surface. Is there a way to reduce this? Part of it seems to be caused by a sometimes weird jumping of the extruder van one circle more often than seems necessary.

I've tried several temperatures within the 190-240 range. I've been getting the best results at 230-240 as it flows nicer that way. I've been reading about people trying to bring down the temperature as much as possible. Why is this exactly?

I've also noticed that laying down the first layer works better when I stop the fan (with my finger; not ideal ). Is there a way to do this through the software?

I've done some tests with White PLA. It seems to be more difficult to print than Silver. Similar experiences?

Thanks!

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You've got some nice prints there. The junk on the fan I think it caused by a small area print where you are putting hot filament on warm filament. You need to slow your printing down at this area or slow the whole print down. It might improve once you're using that fan too.

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I have the same problem with the transparant PLA on my Ultimaker and haven't found a solution yet (not searching very hard for it as well though...).

I think it's head-speed related. I also have this when printing other PLAs and particularly at rounded surfaces. Don't know if it has anything to do with is but it seems like the mechanical system (incl. belt/ belt tension) can't keep up with the printing speed making a turn in which a lot of meshes pass the path of the extruder.

It's not a grounded suggestion but just one of my thougths. In case it is the problem, you can try to get the speed down. If you find some time, try it at 50% of the original speed and let's see what happens.

Also look after your belts tension. It's hard to say what a good tension should look like but I needed to get quite a bit extra tension in them to get the print quality up.

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I have the same problem with the transparant PLA on my Ultimaker and haven't found a solution yet (not searching very hard for it as well though...).

I think it's head-speed related. I also have this when printing other PLAs and particularly at rounded surfaces. Don't know if it has anything to do with is but it seems like the mechanical system (incl. belt/ belt tension) can't keep up with the printing speed making a turn in which a lot of meshes pass the path of the extruder.

It's not a grounded suggestion but just one of my thougths. In case it is the problem, you can try to get the speed down. If you find some time, try it at 50% of the original speed and let's see what happens.

Also look after your belts tension. It's hard to say what a good tension should look like but I needed to get quite a bit extra tension in them to get the print quality up.

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Ultimaker Cura 4.0 is mainly focused on the improved user interface and cloud integration.
As always, we want to collect your user feedback for this release. If there are any improvements you can think of, feel free to mention it here and help us to shape the next release.